Radioreceiver



M. DU PEROW RADIORECEIV'ER Filed March 24, 1926 Patented Jan. 1, 1929;.

MORTIMER DU PEROW, OF WASHINGTON, DISTRICT OF COLUMBIA.

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Application filed March 24, 1926. Serial No. 97,126.

This invention relates to a radio receiver adapted to take the place of the ordinary ear phones and to emit sound waves in loud enough tones so that they may be heard at a distance from the receiver. In carrying out the invention, a plurality of diaphragms. arranged opposite one another, agdmagnets, connected in series or in multiple in the receiving circuit, are arranged adjacent these latter diaphragms and adapted to vibrate them simultaneously in opposite directions, whereby the air within the chamber is alternately compressed and rarefied. A partition is preferably placed between these two diaphragms so that the air set in motion by the openings which are closed by one will not impinge directly upon the other,

and the force of the vibrations will be directed outwardly toward the periphery of the cas-' ing where several other sensitive diaphragms are arranged.

In the accompanying drawing,

Fig. 1 is a diagrammaticyiew showing a direct-coupled receiving. set with my improved sound reproducing device connected therein;

Fig. 2 is a section through the receiving device, taken on the line 22 of Fig. 3; and,

Fig. 3 is a similar view taken on the line 33 of Fig. 2.

Referring to the drawing, a represents diagrammatically the circuits of a receiving set, which need not be particularly described, 6 represents a detector or rectifier, and 0 indicates the receiver of my invention, connected in series with the rectifier in the place of the usual head phones. his to be understood that the receiver may shown or may be substituted for the head phones or load speakers in the various forms of radio receiving sets having currentamplifying means.

The receiver comprises a hollow body 1, preferably made 01E molded insulating material, and of cylindrical form. This drumshaped body has openings in its ends which are closed by diaphragms 2 and 3, of magnetizable metal, and it also has a plurality of openings in its periphery which are closed by iaphragms 4, 5, 6, and 7 these latter diaphragms being preferably considerably larger than the diaphragms 2 and 3.

A partition 8 is arranged midway between the metal diaphragms and parallel therewith,

I provide a. hollow body havingv Two of these diaphragms are.

be used in the simple set.

this p-artitionbeing in the form of a disk which extends into close proximity to the peripheral diaphragms. The purpose of this partition is \to prevent the air, which is set in motion by the vibration of one of the smaller diaphragms, from directly affecting the opposing diaphragm, and to cause the im' pulses to be directed outwardly toward the peripheral diaphragms.

Magnets 9 and 10 are arranged with their pole-pieces close to the diaphragms 2 and 3,

respectively, and the coils of these magnets are connected in series in the receiving circuit, as shown in Fig. 1, but they may beconnected in multiple. The magnets, cause the dia phragm to be pulled'outward simultaneouslyand to be-released simultaneously, so that the air vibrations within the casing will have twice the mechanical force that they would have if only one diaphragm .wereused. The force of the vibrations is transmitted -to the diaphragms on the periphery of the casing, with the result that the latter emit sounds .which can be heard at a distance from the device. a

The magnets are mounted on the inner sides of plates 11 which extend over the ends of the drum, and these plates enclose the dia-. phragms 2 and 3 so that the latter will not be afiected by air vibrations from sources external to the drum and so that sound waves set up bythese diaphragms will not pass out and interfere with sound waves'emittedby the peripheral diaphragms.

What ll claim is:

1. A radio receiver comprising a hollow body having a plurality of openings and diaphragms closing said openings, said body and diaphragms forming an enclosed air chamber, one of said diaphragms' being of. 'magnetizable metahand a magnet, supported independently of the diaphra n s, having a polepiece arranged close to =1 latter diaphragms.

2. A radio receivercomprising a hollow body having more than two. openin s. and diaphragms' closing said openings, sai body and diaphragms forming an enclosed air chamber, two of said diaphragms being of magnetizable metal, and'magnets, supported independently of the diaphragms, connected to a common .current source and adapted, when energized, to, act oppositely on the --lat ter diaphragms.

3. A radio receiver comprising a hollow too body having more than two openings and diaphragms closing said openings, saidbody and diaphragms forming an enclosed air chamber, two of said diaphragms being of magnetizable metal and being arranged opposite one another, and magnets, supported independently of the diaphragms, connected to a common current source and adapted when energized to act oppositely on the lat ter diaphragms.

4. A radio receiver comprising a hollow body having a plurality of openings and diaphragms closing said openings, said body and diaphragms forming an enclosed air chamber, two of said diaphragmsbeing of magnetizable metal and arranged opposite one another and the other diaphragms being arranged in planes at right angles to the planes of said magnetizable diaphragms, a partisignature.

cylindrical body having openings in its sides and a plurality of openings in its periphery and having diaphragms closing said openings; the diaphragms in the sides of the casing being of magnetiz able metal, a partition between said latter diaphragms and extending close to the diaphragms inthe periphery,

and magnets having polepieces adjacent said magnetizablc diaphragms and connected to a common current source.

In testimony whereof I hereunto afiix my MORTIMER DU PEROW. 

